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Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Tests  >  Test: Ohm’s Law For a Magnetic Circuit - Electrical Engineering (EE) MCQ

Test: Ohm’s Law For a Magnetic Circuit - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test - Test: Ohm’s Law For a Magnetic Circuit

Test: Ohm’s Law For a Magnetic Circuit for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Ohm’s Law For a Magnetic Circuit questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Ohm’s Law For a Magnetic Circuit MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Ohm’s Law For a Magnetic Circuit below.
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Test: Ohm’s Law For a Magnetic Circuit - Question 1
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 Ohm’s law for magnetic circuits is _________

Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 1

Ohm’s law for magnetic circuits states that the MMF is directly proportional to the magnetic flux where reluctance is the constant of proportionality.

Test: Ohm’s Law For a Magnetic Circuit - Question 2
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What happens to the MMF when the magnetic flux decreases?

Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 2

Ohm’s law for magnetic circuit’s states that the MMF is directly proportional to the magnetic flux hence as the magnetic flux decreases, the MMF also decreases.

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Test: Ohm’s Law For a Magnetic Circuit - Question 3
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 Calculate the MMF when the magnetic flux is 5Wb and the reluctance is 3A/Wb.

Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 3

We know that:
F=ϕS
Substituting the given values from the question, we get MMF= 15At.

Test: Ohm’s Law For a Magnetic Circuit - Question 4
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A ring having a cross-sectional area of 500 mm2, a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Calculate the flux density of the ring.
Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 4

From the given question:
Flux density= 800*10-6/500*106=1.6 Wb/m2.

Test: Ohm’s Law For a Magnetic Circuit - Question 5
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A ring having a cross-sectional area of 500 mm2, a circumference of and ϕ=800microWb 400 mm has a coil of 200 turns wound around it. Calculate the reluctance.
Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 5

From the given question:
Flux density= 800*10-6/500*106=1.6 Wb/m2.
Reluctance= 0.4/(380*4*pi*10-7*10-4*5)=1.68 * 106 A/Wb.

Test: Ohm’s Law For a Magnetic Circuit - Question 6
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A ring having a cross-sectional area of 500 mm2, a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Calculate the magnetomotive force.
Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 6

We know that:
F=ϕS
Substituting the given values from the question, we get F= 1342At.

Test: Ohm’s Law For a Magnetic Circuit - Question 7
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A ring having a cross-sectional area of 500 mm2 , a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Calculate the magnetising current.
Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 7

We know that:
F=ϕS
Substituting the given values from the question, we get F= 1342At.
The magnetic current is:
I=F/N
Substituting the values from the question, we get I=6.7A.

Test: Ohm’s Law For a Magnetic Circuit - Question 8
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Can we apply Kirchhoff’s was to magnetic circuits?
Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 8

Magnetic circuits have an equivalent to the potential difference of electric circuits. This is the magnetic potential difference which allows us to apply Kirchhoff’s laws to magnetic circuit analysis.

Test: Ohm’s Law For a Magnetic Circuit - Question 9
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What is MMF?
Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 9

MMF stands for magnetomotive force. It is the sum of the magnetizing forces along a circuit.

Test: Ohm’s Law For a Magnetic Circuit - Question 10
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The equivalent of the current I in magnetic ohm’s law is?
Detailed Solution for Test: Ohm’s Law For a Magnetic Circuit - Question 10

The equivalent of current in magnetic ohm’s law is flux as:
V=IR is equivalent to F=ϕS.

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